1- edx Universities
EdX is a not-for-profit enterprise of its founding partners Harvard University and the Massachusetts Institute of Technology that features learning designed specifically for interactive study via the web.EdX is based in Cambridge, Massachusetts and is governed by MIT and Harvard.
Coursera is a social entrepreneurship company that partners with the top universities in the world to offer courses online for anyone to take, for free. It offers courses in a wide range of topics, spanning the Humanities, Medicine, Biology, Social Sciences, Mathematics, Business, Computer Science, and many others.
Udacity is a totally new kind of learning experience. You learn by solving challenging problems and pursuing udacious projects with world-renowned university instructors (not by watching long, boring lectures).
4- MR university
(MRUniversity) is a new approach to online education led by professors and of Marginal Revolution.